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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30481edbe1e852effcd58cd358f3eed3b6cb8037b6f56836b5ef8fcc1f7c650' 
  AND token = 'g8RlvuJgAzbSf0v5Rwiry+TP9lTcezk5Tln3pFf44so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}